Vessel
Renal vein
Asymmetric venous outflow from the two kidneys
High-yield
The usual left renal vein passes between aorta and superior mesenteric artery. Compression without symptoms is an anatomical phenomenon; associated clinical features are needed for nutcracker syndrome.
Overview
Renal veins collect blood from communicating intrarenal channels and carry it to the inferior vena cava. The left vein usually crosses the aorta and accepts adrenal and gonadal tributaries, whereas the right has a shorter route. Additional veins and retroaortic or circumaortic left courses occur.
Reference facts
- Origin
- Forms from joining intrarenal veins within the sinus, with substantial communication among venous channels.
- Course
- Usually emerges anterior to major arterial branches and runs to the cava. The left commonly crosses anterior to the aorta; the right takes a short direct course.
- Branches
- The left commonly receives suprarenal and gonadal veins and variable inferior phrenic or lumbar tributaries; right-sided tributary patterns differ and vary.
- Supplies
- Drains renal parenchyma; left-sided tributaries also return blood from the ipsilateral gonad and suprarenal region.
- Drains to
- Terminates in the inferior vena cava, with anatomical variants in course and number.
Clinical correlation
Renal venous obstruction can cause hematuria, flank discomfort or gonadal venous congestion. A renal tumor can extend into the renal vein, but a new varicocele alone does not establish a renal tumor or its venous extension.
Frequently asked questions
Where does the renal vein originate?
Forms from joining intrarenal veins within the sinus, with substantial communication among venous channels.
What territory does the renal vein serve?
Drains renal parenchyma; left-sided tributaries also return blood from the ipsilateral gonad and suprarenal region.
Where does the renal vein drain to?
The renal vein drains to the terminates in the inferior vena cava, with anatomical variants in course and number.
What are the branches of the renal vein?
The left commonly receives suprarenal and gonadal veins and variable inferior phrenic or lumbar tributaries; right-sided tributary patterns differ and vary.